C++ Arduino uint8_t 变量
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Arduino uint8_t variables
提问by David Flanagan
I'm having trouble with some arduino code. im using an Ethernet tutorial code i found and some IR emitter and receiver code i found, and im trying to combine them.
我遇到了一些 arduino 代码的问题。我正在使用我发现的以太网教程代码和我发现的一些红外发射器和接收器代码，我试图将它们结合起来。
http://www.ladyada.net/learn/sensors/ir.html
http://www.ladyada.net/learn/sensors/ir.html
http://g33k.blogspot.com/2010/09/arduino-data-webserver-sample-web.html
http://g33k.blogspot.com/2010/09/arduino-data-webserver-sample-web.html
Both codes work fine by themselves.
这两个代码本身都可以正常工作。
The code compiles but when i call the following void IRDetector() , it doesn't work. I have debugged it and so far ive found when i use the variable uint8_t or uint16_t (ive tried replacing them with ints and longs). Do i have to import and libraries to use uint8_t ? Any thoughts?
代码编译但当我调用以下 void IRDetector() 时，它不起作用。我已经调试了它，到目前为止我发现当我使用变量 uint8_t 或 uint16_t 时（我尝试用整数和长整数替换它们）。我是否必须导入库才能使用 uint8_t ？有什么想法吗？
Any help would be appreciated.
任何帮助，将不胜感激。
uint16_t pulses[100][2]; // pair is high and low pulse
uint8_t currentpulse = 0; // index for pulses we're storing
uint8_t highpulse, lowpulse; // temporary storage timing
void IRDetectCode(void)
{
while(true){
highpulse = lowpulse = 0; // start out with no pulse length
while (IRpin_PIN & (1 << IRpin)) {
// pin is still HIGH
// count off another few microseconds
highpulse++;
delayMicroseconds(RESOLUTION);
// If the pulse is too long, we 'timed out' - either nothing
// was received or the code is finished, so print what
// we've grabbed so far, and then reset
if ((highpulse >= MAXPULSE) && (currentpulse != 0)) {
Serial.print(" usec, ");
// printpulses();
//currentpulse=0;
return;
}
}
// we didn't time out so lets stash the reading
pulses[currentpulse][0] = highpulse;
// same as above
while (! (IRpin_PIN & _BV(IRpin))) {
// pin is still LOW
Serial.print(" usec, ");
lowpulse++;
delayMicroseconds(RESOLUTION);
if ((lowpulse >= MAXPULSE) && (currentpulse != 0)) {
// printpulses();
// currentpulse=0;
return;
}
}
//pulses[currentpulse][1] = lowpulse;
// we read one high-low pulse successfully, continue!
currentpulse++;
}
}
void printpulses(void) {
Serial.println("\n\r\n\rReceived: \n\rOFF \tON");
for (uint8_t i = 0; i < currentpulse; i++) {
Serial.print(pulses[i][0] * RESOLUTION, DEC);
Serial.print(" usec, ");
Serial.print(pulses[i][1] * RESOLUTION, DEC);
Serial.println(" usec");
}
// print it in a 'array' format
Serial.println("int IRsignal[] = {");
Serial.println("// ON, OFF (in 10's of microseconds)");
for (uint8_t i = 0; i < currentpulse-1; i++) {
Serial.print("\t"); // tab
Serial.print(pulses[i][1] * RESOLUTION / 10, DEC);
Serial.print(", ");
Serial.print(pulses[i+1][0] * RESOLUTION / 10, DEC);
Serial.println(",");
}
Serial.print("\t"); // tab
Serial.print(pulses[currentpulse-1][1] * RESOLUTION / 10, DEC);
Serial.print(", 0};");
}
回答by
The uint8_t is a unsigned integer on 8 bits. In Arduino, it's called a "byte", so you can use it like that:
uint8_t 是一个 8 位无符号整数。在 Arduino 中，它被称为“字节”，因此您可以这样使用它：
for (byte i = 0; i < currentpulse; i++) {....
It's far better than using the Arduino's "int" type (== int16_t) or "unsigned int" (== uint16_t) because the ATmega328 is 8-bit. So handling an 8-bit var is faster (a lot).
它比使用 Arduino 的“int”类型（== int16_t）或“unsigned int”（== uint16_t）好得多，因为 ATmega328 是 8 位的。因此处理 8 位 var 更快（很多）。
I hope it can help.
我希望它能有所帮助。
